Wake-up 1.Explain the difference between one and two way digestion. 1.What is an example of an animal in the phylum Porifera? THINK about what it sounds.

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Presentation transcript:

Wake-up 1.Explain the difference between one and two way digestion. 1.What is an example of an animal in the phylum Porifera? THINK about what it sounds like.

Porifera and Cnidarians

Invertebrates Do not have a backbone/ vertebrate

Phylum Porifera - Sponges

Characteristics: Simplest group of animals

Characteristics: They are sessile, which means that they do not move around; attached

Skeletal system: Spicules; small glass like fragments that provide support

CharacteristicsCharacteristics: Lack tissue; have individual cells that each perform a specific function

FeedingFeeding: Absorb food through membrane or trap within mucus and then absorb

Sponge Feeding Video

Respiratory system: Diffusion; Sponges absorb oxygen and food from their surroundings

Circulatory system: Diffusion; Sponges move oxygen and food from their surroundings through their “body”

Reproductive: Budding (Asexual); a new sponge grows from the original

Reproductive: Fragmentation (Asexual); A piece breaks off of a sponge and then grows into a new organism

Reproductive: Hermaphrodite with Internal Fertilization; Both sexes present; Release sperm to fuse with egg

*

Sponge Harvesting

Wake-up 1.Why are Porifera in the Animal Kingdom? 2.How do sponges consume food?

Phylum Cnidaria

Characteristics: All have tentacles

Two Basic Body Shapes 1. Medusa: Tentacles pointing downward

Two Basic Body Shapes 2. Polyp: Tentacles pointing upward; often sessile.

NematocystsNematocysts: Structures on tentacles that are used to get prey; like a Harpoon gun

*

Skeletal system: Hydrostatic (Water “skeleton”)

Digestive system: Two Way Food moves into the mouth into the gastrovascular cavity to be digested and then back out the mouth

Respiratory system: Diffusion Oxygen is absorbed from surrounding environment

Nervous system: Nerve Net Network of nerves throughout body; respond to stimuli

Reproductive system: Budding Offspring develop from parent; identical copy

Reproductive system: External Fertilization

Example: Sea Anemone

Example: Jellyfish

Life: Creatures of Deep 12:30

Hydra

*

Coral

Planet Earth: Shallow Seas 5:10